If you need help making money in GTA Online watch this video! This is a speed run of the Gerald mission called "Violent Duct" which pays out $9,000 for less than a minute's work. Each run like this this took us an average of 2 minutes (including load time) so doing the math it equates to $270,000 per hour. As of today (Oct 7th, 2013) it is still the fastest way to make money even at rank 40s & 50. Stay tuned to the end of the video to see the rank 50 Merryweather Airstrike ability.

I made this video to illustrate one of my main problems with this game. This is easy money but it's a symptom of a serious flaw in progression when a lvl 50 would rather grind this noob mission instead of doing high level missions because this pays better.

I see the point you've been making about this, Kodo. I have to say too the tactic of you running in while your team does the killing/distraction seems like it could be a pretty fun way to approach these sorts of jobs.

There's a lvl 45 mission from Martin Madrozzo that we found gives $18,000 and 3,000 rep per run, it can be done in 30 seconds to 1 minute, it winds up being much more efficient like $700/hr and 160k/hr. I will put together a video for this soon. Also found a lvl 65 mission that pays out $25,000 per run.

I unlocked Violent Duct today, and unfortunately didn't know the trick to replaying it post-patch till after I'd done it, so I can only redo it if someone puts out an open invite during a session. Still, I'm not too far from my goal of buying a decent pad now, so I can't complain too much.